| Start/ | End/ | |||
| True | False | - | Line | Source |
| 1 | /* | |||
| 2 | * IA-32 Huge TLB Page Support for Kernel. | |||
| 3 | * | |||
| 4 | * Copyright (C) 2002, Rohit Seth <rohit.seth@intel.com> | |||
| 5 | */ | |||
| 6 | ||||
| 7 | #include <linux/config.h> | |||
| 8 | #include <linux/init.h> | |||
| 9 | #include <linux/fs.h> | |||
| 10 | #include <linux/mm.h> | |||
| 11 | #include <linux/hugetlb.h> | |||
| 12 | #include <linux/pagemap.h> | |||
| 13 | #include <linux/smp_lock.h> | |||
| 14 | #include <linux/slab.h> | |||
| 15 | #include <linux/err.h> | |||
| 16 | #include <linux/sysctl.h> | |||
| 17 | #include <asm/mman.h> | |||
| 18 | #include <asm/tlb.h> | |||
| 19 | #include <asm/tlbflush.h> | |||
| 20 | ||||
| 0 | 0 | - | 21 | pte_t *huge_pte_alloc(struct mm_struct *mm, unsigned long addr) |
| 22 | { | |||
| 23 | pgd_t *pgd; | |||
| 24 | pud_t *pud; | |||
| 25 | pte_t *pte = NULL; | |||
| 26 | ||||
| 27 | pgd = pgd_offset(mm, addr); | |||
| 28 | pud = pud_alloc(mm, pgd, addr); | |||
| 0 | 0 | - | 29 | if (pud) |
| 30 | pte = (pte_t *) pmd_alloc(mm, pud, addr); | |||
| 31 | BUG_ON(pte && !pte_none(*pte) && !pte_huge(*pte)); | |||
| 0 | 0 | - | 31 | if (__builtin_expect ( ! ! ( ( pte && ! ( ! .. |
| 0 | 0 | - | 31 | do-while (0) |
| 32 | ||||
| 0 | - | 33 | return pte; | |
| 34 | } | |||
| 35 | ||||
| 0 | 0 | - | 36 | pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr) |
| 37 | { | |||
| 38 | pgd_t *pgd; | |||
| 39 | pud_t *pud; | |||
| 40 | pmd_t *pmd = NULL; | |||
| 41 | ||||
| 42 | pgd = pgd_offset(mm, addr); | |||
| 0 | 0 | - | 43 | if (pgd_present(*pgd)) { |
| 44 | pud = pud_offset(pgd, addr); | |||
| 0 | 0 | - | 45 | if (pud_present(*pud)) |
| 46 | pmd = pmd_offset(pud, addr); | |||
| 47 | } | |||
| 0 | - | 48 | return (pte_t *) pmd; | |
| 49 | } | |||
| 50 | ||||
| 51 | /* | |||
| 52 | * This function checks for proper alignment of input addr and len parameters. | |||
| 53 | */ | |||
| 0 | 0 | - | 54 | int is_aligned_hugepage_range(unsigned long addr, unsigned long len) |
| 55 | { | |||
| 0 | 0 | - | 56 | if (len & ~HPAGE_MASK) |
| 0 | - | 57 | return -EINVAL; | |
| 0 | 0 | - | 58 | if (addr & ~HPAGE_MASK) |
| 0 | - | 59 | return -EINVAL; | |
| 0 | - | 60 | return 0; | |
| 61 | } | |||
| 62 | ||||
| 63 | #if 0 /* This is just for testing */ | |||
| 64 | struct page * | |||
| 65 | follow_huge_addr(struct mm_struct *mm, unsigned long address, int write) | |||
| 66 | { | |||
| 67 | unsigned long start = address; | |||
| 68 | int length = 1; | |||
| 69 | int nr; | |||
| 70 | struct page *page; | |||
| 71 | struct vm_area_struct *vma; | |||
| 72 | ||||
| 73 | vma = find_vma(mm, addr); | |||
| 74 | if (!vma || !is_vm_hugetlb_page(vma)) | |||
| 75 | return ERR_PTR(-EINVAL); | |||
| 76 | ||||
| 77 | pte = huge_pte_offset(mm, address); | |||
| 78 | ||||
| 79 | /* hugetlb should be locked, and hence, prefaulted */ | |||
| 80 | WARN_ON(!pte || pte_none(*pte)); | |||
| 81 | ||||
| 82 | page = &pte_page(*pte)[vpfn % (HPAGE_SIZE/PAGE_SIZE)]; | |||
| 83 | ||||
| 84 | WARN_ON(!PageCompound(page)); | |||
| 85 | ||||
| 86 | return page; | |||
| 87 | } | |||
| 88 | ||||
| 89 | int pmd_huge(pmd_t pmd) | |||
| 90 | { | |||
| 91 | return 0; | |||
| 92 | } | |||
| 93 | ||||
| 94 | struct page * | |||
| 95 | follow_huge_pmd(struct mm_struct *mm, unsigned long address, | |||
| 96 | pmd_t *pmd, int write) | |||
| 97 | { | |||
| 98 | return NULL; | |||
| 99 | } | |||
| 100 | ||||
| 101 | #else | |||
| 102 | ||||
| 103 | struct page * | |||
| 468316 | 0 | 104 | follow_huge_addr(struct mm_struct *mm, unsigned long address, int write) | |
| 105 | { | |||
| 468316 | 106 | return ERR_PTR(-EINVAL); | ||
| 107 | } | |||
| 108 | ||||
| 468304 | 0 | 109 | int pmd_huge(pmd_t pmd) | |
| 110 | { | |||
| 468304 | 111 | return !!(pmd_val(pmd) & _PAGE_PSE); | ||
| 112 | } | |||
| 113 | ||||
| 114 | struct page * | |||
| 0 | 0 | - | 115 | follow_huge_pmd(struct mm_struct *mm, unsigned long address, |
| 116 | pmd_t *pmd, int write) | |||
| 117 | { | |||
| 118 | struct page *page; | |||
| 119 | ||||
| 120 | page = pte_page(*(pte_t *)pmd); | |||
| 0 | 0 | - | 121 | if (page) |
| 122 | page += ((address & ~HPAGE_MASK) >> PAGE_SHIFT); | |||
| 0 | - | 123 | return page; | |
| 124 | } | |||
| 125 | #endif | |||
| 126 | ||||
| 127 | /* x86_64 also uses this file */ | |||
| 128 | ||||
| 129 | #ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA | |||
| 130 | static unsigned long hugetlb_get_unmapped_area_bottomup(struct file *file, | |||
| 131 | unsigned long addr, unsigned long len, | |||
| 132 | unsigned long pgoff, unsigned long flags) | |||
| 133 | { | |||
| 134 | struct mm_struct *mm = current->mm; | |||
| 135 | struct vm_area_struct *vma; | |||
| 136 | unsigned long start_addr; | |||
| 137 | ||||
| 138 | if (len > mm->cached_hole_size) { | |||
| 139 | start_addr = mm->free_area_cache; | |||
| 140 | } else { | |||
| 141 | start_addr = TASK_UNMAPPED_BASE; | |||
| 142 | mm->cached_hole_size = 0; | |||
| 143 | } | |||
| 144 | ||||
| 145 | full_search: | |||
| 146 | addr = ALIGN(start_addr, HPAGE_SIZE); | |||
| 147 | ||||
| 148 | for (vma = find_vma(mm, addr); ; vma = vma->vm_next) { | |||
| 149 | /* At this point: (!vma || addr < vma->vm_end). */ | |||
| 150 | if (TASK_SIZE - len < addr) { | |||
| 151 | /* | |||
| 152 | * Start a new search - just in case we missed | |||
| 153 | * some holes. | |||
| 154 | */ | |||
| 155 | if (start_addr != TASK_UNMAPPED_BASE) { | |||
| 156 | start_addr = TASK_UNMAPPED_BASE; | |||
| 157 | mm->cached_hole_size = 0; | |||
| 158 | goto full_search; | |||
| 159 | } | |||
| 160 | return -ENOMEM; | |||
| 161 | } | |||
| 162 | if (!vma || addr + len <= vma->vm_start) { | |||
| 163 | mm->free_area_cache = addr + len; | |||
| 164 | return addr; | |||
| 165 | } | |||
| 166 | if (addr + mm->cached_hole_size < vma->vm_start) | |||
| 167 | mm->cached_hole_size = vma->vm_start - addr; | |||
| 168 | addr = ALIGN(vma->vm_end, HPAGE_SIZE); | |||
| 169 | } | |||
| 170 | } | |||
| 171 | ||||
| 172 | static unsigned long hugetlb_get_unmapped_area_topdown(struct file *file, | |||
| 173 | unsigned long addr0, unsigned long len, | |||
| 174 | unsigned long pgoff, unsigned long flags) | |||
| 175 | { | |||
| 176 | struct mm_struct *mm = current->mm; | |||
| 177 | struct vm_area_struct *vma, *prev_vma; | |||
| 178 | unsigned long base = mm->mmap_base, addr = addr0; | |||
| 179 | unsigned long largest_hole = mm->cached_hole_size; | |||
| 180 | int first_time = 1; | |||
| 181 | ||||
| 182 | /* don't allow allocations above current base */ | |||
| 183 | if (mm->free_area_cache > base) | |||
| 184 | mm->free_area_cache = base; | |||
| 185 | ||||
| 186 | if (len <= largest_hole) { | |||
| 187 | largest_hole = 0; | |||
| 188 | mm->free_area_cache = base; | |||
| 189 | } | |||
| 190 | try_again: | |||
| 191 | /* make sure it can fit in the remaining address space */ | |||
| 192 | if (mm->free_area_cache < len) | |||
| 193 | goto fail; | |||
| 194 | ||||
| 195 | /* either no address requested or cant fit in requested address hole */ | |||
| 196 | addr = (mm->free_area_cache - len) & HPAGE_MASK; | |||
| 197 | do { | |||
| 198 | /* | |||
| 199 | * Lookup failure means no vma is above this address, | |||
| 200 | * i.e. return with success: | |||
| 201 | */ | |||
| 202 | if (!(vma = find_vma_prev(mm, addr, &prev_vma))) | |||
| 203 | return addr; | |||
| 204 | ||||
| 205 | /* | |||
| 206 | * new region fits between prev_vma->vm_end and | |||
| 207 | * vma->vm_start, use it: | |||
| 208 | */ | |||
| 209 | if (addr + len <= vma->vm_start && | |||
| 210 | (!prev_vma || (addr >= prev_vma->vm_end))) { | |||
| 211 | /* remember the address as a hint for next time */ | |||
| 212 | mm->cached_hole_size = largest_hole; | |||
| 213 | return (mm->free_area_cache = addr); | |||
| 214 | } else { | |||
| 215 | /* pull free_area_cache down to the first hole */ | |||
| 216 | if (mm->free_area_cache == vma->vm_end) { | |||
| 217 | mm->free_area_cache = vma->vm_start; | |||
| 218 | mm->cached_hole_size = largest_hole; | |||
| 219 | } | |||
| 220 | } | |||
| 221 | ||||
| 222 | /* remember the largest hole we saw so far */ | |||
| 223 | if (addr + largest_hole < vma->vm_start) | |||
| 224 | largest_hole = vma->vm_start - addr; | |||
| 225 | ||||
| 226 | /* try just below the current vma->vm_start */ | |||
| 227 | addr = (vma->vm_start - len) & HPAGE_MASK; | |||
| 228 | } while (len <= vma->vm_start); | |||
| 229 | ||||
| 230 | fail: | |||
| 231 | /* | |||
| 232 | * if hint left us with no space for the requested | |||
| 233 | * mapping then try again: | |||
| 234 | */ | |||
| 235 | if (first_time) { | |||
| 236 | mm->free_area_cache = base; | |||
| 237 | largest_hole = 0; | |||
| 238 | first_time = 0; | |||
| 239 | goto try_again; | |||
| 240 | } | |||
| 241 | /* | |||
| 242 | * A failed mmap() very likely causes application failure, | |||
| 243 | * so fall back to the bottom-up function here. This scenario | |||
| 244 | * can happen with large stack limits and large mmap() | |||
| 245 | * allocations. | |||
| 246 | */ | |||
| 247 | mm->free_area_cache = TASK_UNMAPPED_BASE; | |||
| 248 | mm->cached_hole_size = ~0UL; | |||
| 249 | addr = hugetlb_get_unmapped_area_bottomup(file, addr0, | |||
| 250 | len, pgoff, flags); | |||
| 251 | ||||
| 252 | /* | |||
| 253 | * Restore the topdown base: | |||
| 254 | */ | |||
| 255 | mm->free_area_cache = base; | |||
| 256 | mm->cached_hole_size = ~0UL; | |||
| 257 | ||||
| 258 | return addr; | |||
| 259 | } | |||
| 260 | ||||
| 261 | unsigned long | |||
| 262 | hugetlb_get_unmapped_area(struct file *file, unsigned long addr, | |||
| 263 | unsigned long len, unsigned long pgoff, unsigned long flags) | |||
| 264 | { | |||
| 265 | struct mm_struct *mm = current->mm; | |||
| 266 | struct vm_area_struct *vma; | |||
| 267 | ||||
| 268 | if (len & ~HPAGE_MASK) | |||
| 269 | return -EINVAL; | |||
| 270 | if (len > TASK_SIZE) | |||
| 271 | return -ENOMEM; | |||
| 272 | ||||
| 273 | if (addr) { | |||
| 274 | addr = ALIGN(addr, HPAGE_SIZE); | |||
| 275 | vma = find_vma(mm, addr); | |||
| 276 | if (TASK_SIZE - len >= addr && | |||
| 277 | (!vma || addr + len <= vma->vm_start)) | |||
| 278 | return addr; | |||
| 279 | } | |||
| 280 | if (mm->get_unmapped_area == arch_get_unmapped_area) | |||
| 281 | return hugetlb_get_unmapped_area_bottomup(file, addr, len, | |||
| 282 | pgoff, flags); | |||
| 283 | else | |||
| 284 | return hugetlb_get_unmapped_area_topdown(file, addr, len, | |||
| 285 | pgoff, flags); | |||
| 286 | } | |||
| 287 | ||||
| 288 | #endif /*HAVE_ARCH_HUGETLB_UNMAPPED_AREA*/ | |||
| 289 | ||||
| ***TER 13% (4/30) of SOURCE FILE hugetlbpage.c | ||||